Gmail/Inbox Email Purge Script

Time-based.Gmail.Email.Purge.Script.gs

// Gmail/Inbox Email Purge Script
// Using Google Script
// Clears out all emails older than X days

// Labels
function multipleLabels() {
  var myLabels = {
    '"Updates"': "7d",
    '"Forums"': "7d",
    '"Promotions"': "7d",
  };
  var batchSize = 100; // Process up to 100 threads at once
  for(aLabel in myLabels)
  {
    var threads = GmailApp.search('label:'+aLabel+' older_than:'+myLabels[aLabel]+'');
    Logger.log("Purged " + threads.length + " threads from" + aLabel);    
    for (j = 0; j < threads.length; j+=batchSize) {
      GmailApp.moveThreadsToTrash(threads.slice(j, j+batchSize));
    }
  }  
}

// Categories
function multipleCategories() {
  var myCategories = {
    '"Updates"': "4d",
    '"Forums"': "7d",
    '"Promotions"': "7d",
    '"Social"': "7d",
  };
  var batchSize = 100; // Process up to 100 threads at once
  for(aCategory in myCategories)
  {
    var threads = GmailApp.search('category:'+aCategory+' older_than:'+myCategories[aCategory]+'');
    Logger.log("Purged " + threads.length + " threads from" + aCategory);
    for (j = 0; j < threads.length; j+=batchSize) {
      GmailApp.moveThreadsToTrash(threads.slice(j, j+batchSize));
    }
  }  
}